import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import Stats from 'three/addons/libs/stats.module.js';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { OrbitControls0 } from 'three/addons/controls/OrbitControls0.js';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {

  let camera, scene, renderer, controls, stats;

  let mesh;
  const amount = parseInt( window.location.search.slice( 1 ) ) || 10;
  const count = Math.pow( amount, 3 );

  const raycaster = new THREE.Raycaster();
  const mouse = new THREE.Vector2( 1, 1 );

  const color = new THREE.Color();
  const white = new THREE.Color().setHex( 0xffffff );

  init();
  animate();

  function init() {

    camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
    camera.position.set( amount, amount, amount );
    camera.lookAt( 0, 0, 0 );

    scene = new THREE.Scene();

    const light = new THREE.HemisphereLight( 0xffffff, 0x888888, 3 );
    light.position.set( 0, 1, 0 );
    scene.add( light );

    const geometry = new THREE.IcosahedronGeometry( 0.5, 3 );
    const material = new THREE.MeshPhongMaterial( { color: 0xffffff } );

    mesh = new THREE.InstancedMesh( geometry, material, count );

    let i = 0;
    const offset = ( amount - 1 ) / 2;

    const matrix = new THREE.Matrix4();

    for ( let x = 0; x < amount; x ++ ) {

      for ( let y = 0; y < amount; y ++ ) {

        for ( let z = 0; z < amount; z ++ ) {

          matrix.setPosition( offset - x, offset - y, offset - z );

          mesh.setMatrixAt( i, matrix );
          mesh.setColorAt( i, color );

          i ++;

        }

      }

    }

    scene.add( mesh );

    //

    const gui = new GUI();
    gui.add( mesh, 'count', 0, count );

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );

    controls = new (window.platform=="devtools"?OrbitControls:OrbitControls0)( camera, renderer.domElement );
    controls.enableDamping = true;
    controls.enableZoom = false;
    controls.enablePan = false;

    stats = new Stats();
    document.body.appendChild( stats.dom );

    window.addEventListener( 'resize', onWindowResize );
    document.addEventListener( 'mousemove', onMouseMove );

  }

  function onWindowResize() {

    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

  }

  function onMouseMove( event ) {

    event.preventDefault();

    mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
    mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

  }

  function animate() {

    requestId = requestAnimationFrame( animate );

    controls.update();

    raycaster.setFromCamera( mouse, camera );

    const intersection = raycaster.intersectObject( mesh );

    if ( intersection.length > 0 ) {

      const instanceId = intersection[ 0 ].instanceId;

      mesh.getColorAt( instanceId, color );

      if ( color.equals( white ) ) {

        mesh.setColorAt( instanceId, color.setHex( Math.random() * 0xffffff ) );

        mesh.instanceColor.needsUpdate = true;

      }

    }

    render();

    stats.update();

  }

  function render() {

    renderer.render( scene, camera );

  }
  }
})